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LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 12:06 pm
by splitdecision71
I have a sbc 406 with cast iron bowtie heads and recently bought some Brodix 11x heads with 2.100/1.625 valves and they have been ported by hand and look pretty amazing. Was told they flowed 306 @ .700. Jesel rockers with 1.65 intake and 1.60 exhaust. Because of 60/40 valve center line im going to have to order pistons. Im looking for advice on build. Car weighs 2760 lbs, powerglide, 4.56s, 31x13x15 rear tire. Rear ladder bar suspension car. Car is running 6.80s to 6.90s @ 99-100mph with current set up depending on DA. Have sprayed 300 in two stages and run 6.27 @ 108 mph. My goal is 5.99 to 6.0 on motor so I can run most index classes on motor. Looking for good cam, compression, piston combo to get me where I want to be on this 406sbc. Any help appreciated. Thanks in advance and Im new to forum.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 12:15 pm
by mag2555
What body car is this 406 in?
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 12:42 pm
by Frankshaft
splitdecision71 wrote: ↑Mon Oct 01, 2018 12:06 pm
I have a sbc 406 with cast iron bowtie heads and recently bought some Brodix 11x heads with 2.100/1.625 valves and they have been ported by hand and look pretty amazing. Was told they flowed 306 @ .700. Jesel rockers with 1.65 intake and 1.60 exhaust. Because of 60/40 valve center line im going to have to order pistons. Im looking for advice on build. Car weighs 2760 lbs, powerglide, 4.56s, 31x13x15 rear tire. Rear ladder bar suspension car. Car is running 6.80s to 6.90s @ 99-100mph with current set up depending on DA. Have sprayed 300 in two stages and run 6.27 @ 108 mph. My goal is 5.99 to 6.0 on motor so I can run most index classes on motor. Looking for good cam, compression, piston combo to get me where I want to be on this 406sbc. Any help appreciated. Thanks in advance and Im new to forum.
I think you might be blowing thru your converter on the nitrous. Your old set up should run 5.90's with a 300 shot easy. It in all honesty, should be running what you run on the bottle now, on the Engine. At 2760 lbs
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 1:08 pm
by MadBill
If you already have pistons suitable in every other way, can't you just touch up the reliefs to suit the 60/40 shifts?
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 1:26 pm
by Frankshaft
MadBill wrote: ↑Mon Oct 01, 2018 1:08 pm
If you already have pistons suitable in every other way, can't you just touch up the reliefs to suit the 60/40 shifts?
You can.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:23 pm
by splitdecision71
mag2555 wrote: ↑Mon Oct 01, 2018 12:15 pm
What body car is this 406 in?
Sorry about that! Its a 1964 Chevy II
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:25 pm
by splitdecision71
Frankshaft wrote: ↑Mon Oct 01, 2018 12:42 pm
splitdecision71 wrote: ↑Mon Oct 01, 2018 12:06 pm
I have a sbc 406 with cast iron bowtie heads and recently bought some Brodix 11x heads with 2.100/1.625 valves and they have been ported by hand and look pretty amazing. Was told they flowed 306 @ .700. Jesel rockers with 1.65 intake and 1.60 exhaust. Because of 60/40 valve center line im going to have to order pistons. Im looking for advice on build. Car weighs 2760 lbs, powerglide, 4.56s, 31x13x15 rear tire. Rear ladder bar suspension car. Car is running 6.80s to 6.90s @ 99-100mph with current set up depending on DA. Have sprayed 300 in two stages and run 6.27 @ 108 mph. My goal is 5.99 to 6.0 on motor so I can run most index classes on motor. Looking for good cam, compression, piston combo to get me where I want to be on this 406sbc. Any help appreciated. Thanks in advance and Im new to forum.
I think you might be blowing thru your converter on the nitrous. Your old set up should run 5.90's with a 300 shot easy. It in all honesty, should be running what you run on the bottle now, on the Engine. At 2760 lbs
I think your correct sir.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:27 pm
by splitdecision71
MadBill wrote: ↑Mon Oct 01, 2018 1:08 pm
If you already have pistons suitable in every other way, can't you just touch up the reliefs to suit the 60/40 shifts?
Didnt know that could be done. Wouldnt that change the balance of the rotating assembly? Please explain further. Would love to use what I have.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:29 pm
by splitdecision71
Frankshaft wrote: ↑Mon Oct 01, 2018 1:26 pm
MadBill wrote: ↑Mon Oct 01, 2018 1:08 pm
If you already have pistons suitable in every other way, can't you just touch up the reliefs to suit the 60/40 shifts?
You can.
Please explain. Would love to use what I have and spend money else where. Wouldnt shaving on the pistons change the balance of the rotating assembly? Need to have it rebalanced?
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:33 pm
by splitdecision71
This car was built back in the early 90s and was last ran in 95 or 96. A good friend left it to me while he is away. It had been sitting since 1998 and I have brought it back to life. It has really old technology in it and Im slowly upgrading. Think these heads will be a substantial upgrade.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 2:48 pm
by steve316
You will not remove enough weight from your pistons to require a re-balance.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 3:06 pm
by splitdecision71
steve316 wrote: ↑Mon Oct 01, 2018 2:48 pm
You will not remove enough weight from your pistons to require a re-balance.
Ok thanks, I will look in to doing this!
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 3:20 pm
by JoePorting
Your old pistons will probably work as is. Most piston manufacturers make the valve reliefs extra large to accommodate most aftermarket cylinder heads. Just mock them up and check the clearance with clay.
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 4:33 pm
by ZIGGY
Stock block?
Re: LOOKING FOR ENGINE BUILDER ADVICE.
Posted: Mon Oct 01, 2018 4:47 pm
by splitdecision71
JoePorting wrote: ↑Mon Oct 01, 2018 3:20 pm
Your old pistons will probably work as is. Most piston manufacturers make the valve reliefs extra large to accommodate most aftermarket cylinder heads. Just mock them up and check the clearance with clay.
So you think I can go from the 2.02/1.6 to the 2.100/1.625 with the 60/40 split and be ok? Man that would be awesome.