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  #16 (permalink)  
Old 05-17-2013, 04:19 PM
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If you have the right chassis/driveline set-up...Run those heads with a smallish SOLID LIFTER flat tappet cam (if on a budget), and you will be surprised at how well it will run.

You won't get there with a hydraulic flat tappet

Keep the duration on the small side to help tame the large heads....this is the same idea as the modern GM LS engines are built around.

Cam around 240-250 intake duration at .050" with .515-.560" valve lift, 244-254 exhaust duration @ .050" with similar .515-.560" lift, ground on a 105 or 106 lobe separation, and installed 3-6 advanced(so it is in at a 100-104 intake lobe centerline). Smallish duration for a solid, and the tight lobe separation will help lower rpm power, as will the advanced installed centerline.

A good example would be Howards Cams # 112062, which is 240 intake/250 exhaust dur @ .050", .525/.525" lift, on a 106 lobe separation...Listed as 3000-6400 rpm powerband, super throttle response, and stump pulling low and mid range torque. This cam would be a similar idea to the old late 60's-1970 LT-1 350 cam in feel, with better response because of the newer lobe profile technology. It would work well with your compression ratio,... which due to stock pistons will be lucky to hit 9.6-1 even with the heads cut to 62cc.

Howards # 110812 could also work, it is a tight lash solid with 248/252 dur @ .050", .535/.540" lift, 106 lobe separation, listed as 2500-6500 rpm power range.

I'd recommend getting the Direct Lube lifters, with the oil feed hole in the lifter face, and running a high ZDDP content oil or a ZDDP additive.

Car will need 3.73 rear gears minimum, 4.10 would be even better, and at least 3200 rpm stall converter. Could easily run high 12's in the 1/4 at 3000lbs.

I've built similar compression 327's and 350's using a Crower Cams 247/252 dur, .507/.528" lift Solid Cam that run the # in the 1/4 mile at 3200lbs

Howards is good stuff, find them at Competition Products - Performance Engine Parts, Racing Engine Parts and Accessories

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  #17 (permalink)  
Old 05-17-2013, 11:55 PM
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smallish cam?

Quote:
Originally Posted by ericnova72 View Post
If you have the right chassis/driveline set-up...Run those heads with a smallish SOLID LIFTER flat tappet cam (if on a budget), and you will be surprised at how well it will run.

You won't get there with a hydraulic flat tappet

Keep the duration on the small side to help tame the large heads....this is the same idea as the modern GM LS engines are built around.

Cam around 240-250 intake duration at .050" with .515-.560" valve lift, 244-254 exhaust duration @ .050" with similar .515-.560" lift, ground on a 105 or 106 lobe separation, and installed 3-6 advanced(so it is in at a 100-104 intake lobe centerline). Smallish duration for a solid, and the tight lobe separation will help lower rpm power, as will the advanced installed centerline.

A good example would be Howards Cams # 112062, which is 240 intake/250 exhaust dur @ .050", .525/.525" lift, on a 106 lobe separation...Listed as 3000-6400 rpm powerband, super throttle response, and stump pulling low and mid range torque. This cam would be a similar idea to the old late 60's-1970 LT-1 350 cam in feel, with better response because of the newer lobe profile technology. It would work well with your compression ratio,... which due to stock pistons will be lucky to hit 9.6-1 even with the heads cut to 62cc.

Howards # 110812 could also work, it is a tight lash solid with 248/252 dur @ .050", .535/.540" lift, 106 lobe separation, listed as 2500-6500 rpm power range.

I'd recommend getting the Direct Lube lifters, with the oil feed hole in the lifter face, and running a high ZDDP content oil or a ZDDP additive.

Car will need 3.73 rear gears minimum, 4.10 would be even better, and at least 3200 rpm stall converter. Could easily run high 12's in the 1/4 at 3000lbs.

I've built similar compression 327's and 350's using a Crower Cams 247/252 dur, .507/.528" lift Solid Cam that run the # in the 1/4 mile at 3200lbs

Howards is good stuff, find them at Competition Products - Performance Engine Parts, Racing Engine Parts and Accessories

110812-06 CL110812-06
CL110812-06DL (3)
this cam will have a choppy idle
probably makes killer mid range power(for a flat tappet)

USE: a roller,please
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Old 05-18-2013, 01:43 PM
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As said before, sell the heads to somebody with an engine big enough to use those heads. Way too much for a 350. Everything about those heads screams huge cam and high rpms. 200 cc heads ported and 2.050 valves means a low speed slug. Should be able to sell them for $1200-$1500 and get yourself killer heads more suited for your engine.
Use your good fortune at scoring a deal and turn it into a better one.
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