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Author Topic:   Camshaft recommendation
Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 03-25-2002 12:55 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
Went racing for the first time this season Saturday and found out that the rear main is spitting oil out, and there is a knock now. So I will be tearing down the motor to see what is making noise. I think that I want to change the camshaft, and need some help with that. My combo:

-'73 302 block, decked, align honed, .040, honed w/ plates
-Stock crankshaft, 10/10
-Stock rods, beams smoothed, shot peened, resized, ARP bolts
-TRW flat top forged pistons, moly rings, slightly notched (the lift was just high enough for the exhaust valve to leave a mark on the piston crown)
-Fluidampr, SFI flexplate
-Balanced rotating assembly
-ARP head and main studs
-Melling high volume oil pump (makes 80psi at 500rpm idle- does that sound high?)
-Victor Jr. heads (2.05/1.60), 1.6 roller rockers
-Solid lifter camshaft, copy of a Crane
-Victor Jr. intake, port matched
-650DP carb, Holley blue pump, 3/8 aluminum line
-6AL box, duraspark distributor (locked), MSD timing computer, MSD 8.8 wires
-Hooker super comp headers, collector extensions, crankcase evac system
-C4 tranny, manual valve body, Hughes 3000 stall converter
-8" rear end, 4.11 gears, spool, Strange 31 spline axles, 26x8.5 M/T slicks
-Car has gutted interior, roll cage, subframe connectors, probably weighs 3200lbs

When I built the motor, I had a Crane H-286-2 camshaft made into a solid lifter camshaft. It specs at 226/236 @.050, .502/.520 lift, 110 lobe sep. With this cam, I'm getting 20" of manifold vacuum, which seems kinda high to me. Looking back, I don't think the cam is particularily well matched to the head flow numbers. Without changing the converter, and knowing this is a drag race only car (1/4 mile, not 1/8), what cam would you more seasoned racers say that I should have ground for me? I tried to list the entire combo, but if I left any important info out, let me know.

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 03-25-2002 01:32 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
31-639-5 Comp. Best choice.
That 110 cam was killing you.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 03-25-2002 01:34 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Oh yeah, did you get to make any complete passes? If so how quick and fast did you go? I am so horny for racing I get up just reading about others who are getting the opportunity!

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 03-25-2002 02:15 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
Well, yeah. First pass was made with the new holley carb we got. 650DP, milled air horn, jet extensions. I have never used one, so I didn't have it set up at all. It had 28 squirters front and 25 rear, 67/73 jets, 6.5 PV. The car died on the line. Didn't even want to move. Ended up making a 30 second pass at 98mph (don't laugh- everyone starts somewhere). Went back to my notes from this site and set it up with some bigger squirters (35 front, 31 rear) and jets (73/78). We just put 90/10 shocks on it and ranchos out back. Light went green and boy did that suspension move. The car bit hard, fell again, recovered, and bit again to make a lousy 13.73 pass at 102mph, with a 2.2 60' time. Bad news is that it began smoking pretty bad about half track. And then the knocking. We decided to trailer it up when we saw the oil spraying out the rear main. Best pass (of all eight or so we ever got to make) was a 12.90 at about 106mph (with a carter). Never got the carb figured out (that's my goal), and decided to switch to a holley after reading all the info on this site (thanks all). How do you know which pump cam to use with so many choices? I got the supertuning book and take plenty of notes from past threads here, so hopefully we will figure out the thing in time for the june ford weekend at Pacific Raceways (formerly SIR). Bummer, huh?

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 03-25-2002 10:41 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
Like MM says, cam is way too small for a trailer car with racing heads. Get you a good 10" converter, I-beam rods, a bigger cam, and run the horse crap out of it!! If the engine was "knocking", you may have spun a bearing, if so, you shoulda lost some oil pressure. But there's no use guessing since you're gonna tear it down anyway.

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the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 03-26-2002 06:14 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
alex..y was a 110lsa killing his engine as aposed to a 106 lsa??

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chips67
Gearhead

Posts: 663
From: louisville, ky, usa
Registered: Jul 2001

posted 03-26-2002 10:25 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
lsa screwed me! f-303 in an n/a car! looking at the intake and exaust flow rate ratio on these heads evrything i got screams for nitrous. i aint gonna do it.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 03-27-2002 12:49 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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chips67
Gearhead

Posts: 663
From: louisville, ky, usa
Registered: Jul 2001

posted 03-27-2002 05:48 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
i swear i was just reading this post and my neighbor did a huge burnout in front of my house in his 67 nova. i couldnt list everything he has socked into this car just to be sure my 100k 302 doesnt spank his brand new 355. heck, i evn helped him along with his cousin who has a 5 second berretta...his cousin was "helping" him tune it last week. have to admit it did sound stout, it was a rolling burnout. cant wait to get mine ready!!!

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

[This message has been edited by chips67 (edited 03-27-2002).]

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mustangboy
Gearhead

Posts: 1147
From: Ont, Canada
Registered: Mar 2002

posted 03-28-2002 03:48 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
GO get em Chip

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Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 03-28-2002 04:08 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
After we finished the car last summer we drove it down the road, turned around in a col-de-sac, and did a burn out in the street. This old lady from around the corner came driving up behind us and started yelling that we were endangering her kids that built a bike jump in the street. She was like, You kids quit zooming in and outta here with your tires squeeling and all! Slicks squeel?

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