heres my combo , i need more.....help
I agree with above that compression is already a concern with a stock(probably about 7.8:1)short block. You already have too much cam for the Bracketmaster ll cam to work well. I have used this cam on two different hi compression 340's and I did try it in a low comp 8:1 engine with lousy results. I bet your spark plugs are not burning too cleanly even with the proper tune on the Holley.
The Lunati cam you have can get a small block A body into low 12 sec qtr mi times. If the M1 intake is the single plane, keep it. Put your money into the short block with pistons that will give you at least 9.8:1 comp, up to mabe 10.5 max. The overlap on the cam is 74 deg and it is not likely to ping on 93 octane pump gas. I never have detonation problems with my 10.4:1 340 running that cam.
About the engine not pulling past 4,900 rpm's, check your total timing with a dial-back timing light. I bet you are way over-advanced on total timing. I would think that 32-34 deg of total is all you need. So you might need to re-curve the distributor.
Also do a cranking compression test on all 8 cyl. With your cam, you probably need about 160+ psi otherwise that cam is just too much for low compression pistons, David.
I agree with above that compression is already a concern with a stock(probably about 7.8:1)short block. You already have too much cam for the Bracketmaster ll cam to work well. I have used this cam on two different hi compression 340's and I did try it in a low comp 8:1 engine with lousy results. I bet your spark plugs are not burning too cleanly even with the proper tune on the Holley.
The Lunati cam you have can get a small block A body into low 12 sec qtr mi times. If the M1 intake is the single plane, keep it. Put your money into the short block with pistons that will give you at least 9.8:1 comp, up to mabe 10.5 max. The overlap on the cam is 74 deg and it is not likely to ping on 93 octane pump gas. I never have detonation problems with my 10.4:1 340 running that cam.
About the engine not pulling past 4,900 rpm's, check your total timing with a dial-back timing light. I bet you are way over-advanced on total timing. I would think that 32-34 deg of total is all you need. So you might need to re-curve the distributor.
Also do a cranking compression test on all 8 cyl. With your cam, you probably need about 160+ psi otherwise that cam is just too much for low compression pistons, David.