I am rebuilding my 72 Buick 350 engine I am putting the ta sp3 intake with a holley 750 cfm with 10 to 1 compression and a erson tq40h cam how much power do you think it will make?
Engine Dyno Program says 322hp@5000, 390ftlbs@4000. Retard it 4*, hp jumps to 356@5000, 396@4000. Take it with a grain of salt. Small tube headers, open plenum intake, stock heads, .030, 10:1. Ported heads (data gotten from flow numbers I've found on here), 409hp at 5500, 416ftlbs at 4500, also cam retarded 4* from 0.
How much power, you mean how long will it live on pump fuel with a true 10 to 1 compression? You would be better off getting or doing some carfull porting work on the heads then trying to eek by with 10 to 1 comp on today's fuel! 9.5 is all I would be shooting for with iron Heads unless I was ok with running some octane boost additive If all you can get is 93 octane fuel and if the motor makes 180 cranking psi or more then you need to be a master tuner to keep it from pounding itself apart. Along these same lines if the Heads have not been rebuilt well and have good oil control then for sure you will pound the motor apart with 10 to 1 comp! With that Pick for a Cam you'd best have atleast 3.55 gears out back also even if it's a automatic with its greater torque multiplication provided by the Converter!
If tuned well 10 to 1 isn’t an issue. There is a few here running near 11 to 1 on pump gas. But measuring to confirm compression would give you more answers. The big loss in is head flow and headers . The cam needs the extra scavenging. I would suggest an aftermarket distributer. The 72 distributer has barely 16 degrees of mechanical advance according to spec, that would mean you would need 16 initial timing. It may or may not tolerate that much initial timing. Carb will need jetting and vacuum secondarys do come in kinda late on holley carbs. Cam is similar to a ta 310 cam. Should have a 3000 converter
Do you have actual measured compression ratio of 10:1 or is that what the piston box says? HUGE difference. That cam is from the dark ages. If you plan to drive this on the street get a more modern cam design. Crower level 3 or 4. As described you will have low power below 2500 RPM where most street driving occurs and power brakes may not have enough vacuum. Throw a 3500 rpm convertor and 3.73 gears in it and rip from stop light to stop light. All you need to do to increase the head flow is install the TA stage 1 valves, then open the throats to the bottom seat diameter. The throats are the bottleneck in these heads. This will get you about 75% closer to max flow from iron heads. Opening the runners or port matching won't help much if at all.
You wont be disappointed with bumping up the compression. A decent converter, and gear , it should pull well . It may not have the hp numbers your thinking off, but it should make good torque with buicks long rod an stroke. Tuning will key. Alot of exhaust duration, should be lopey but have decent vacuum . I would suggest decking the block.020-.030. Get the piston up higher to the top. And will get compression up . The bigger valves will bring in air flow, especially with the single plane intake. Potential will be much better then stock heads. You have to set springs up anyway, if you’re having a machine shop do that, get some pricing on valve cut and blend. Ta valve set I believe is 300 range for all. Or send them to Derek, and see if Henry at his shop can take on another set of 350 heads. Crammed 2.00 valves in my heads and found 250 plus flow. If your combo is anyway capable of 400 hp it would be with this level of flow. It wasn’t that pricey but maybe more then you budgeted for.
