Gen 4 BBC build

Tiny
RAY CHEVALIER
  • MEMBER
  • 1971 CHEVROLET CHEVELLE
  • 7.4L
  • V8
  • 2WD
  • MANUAL
  • 5,000 MILES
I don’t have any issues, but I have been following your gen IV BBC build playlist on YouTube. Great videos and tons of helpful info! I just wanted to ask if you’ve experienced any issues since the build or if there was anything you would of done differently looking back on it? Also wondering if you ever put it in a dyno to get horsepower and torque numbers? Thank you so much and once again great vids it’s the best I’ve found on YouTube by far!
Do you
have the same problem?
Yes
No
Tuesday, February 23rd, 2021 AT 12:08 PM

3 Replies

Tiny
RYAN L
  • ADMIN
Hello Ray,

Thanks so much for watching! Honestly no, everything we have done has been amazing. Just make sure you have a good machine shop. Use Google Reviews and ask around your local mechanic, they usually know the good shops. We ran into a bit of trouble with ours hence why the series took so long. Not the same machine shop we used for the LS mind you.

We have not dyno'd the big block but we will be dynoing the LS we are building. Maybe one day I will chassis dyno my Camaro and you can get power numbers but if I had to guess I would say right around 500 horsepower and torque.

Thank you so much for your kind words and for watching!

Best,
Ryan
Was this
answer
helpful?
Yes
No
Tuesday, February 23rd, 2021 AT 4:05 PM
Tiny
RAY CHEVALIER
  • MEMBER
Hey Ryan, thank you getting back to me about my previous question about your big block build! I have pretty much wrapped up my build as far as I can get before I have to leave for deployment, but have a few more questions that was hopping you could answer or give me some insight and your opinion on.

My combo is very similar to yours
454 bored.030, decked.010
Same SRP pistons 26cc dome
781 heads with large 2.25 int /1.9 exh valves
Lunati voodoo hydraulic flat tappet cam
Edelbrock victor jr single plane intake

- did you ever calculate your compression ratio? I got the same pistons but used 781 cast iron heads. My block was decked.010 and heads.005 so was curious what my C/R would be? I m guessing around 10.5-1

- leads to my next question is did you ever check piston to valve clearance? I ve heard of guys running even bigger 32cc done pistons without problems so figured the 26cc will have even more clearance and be no problem, but figured I d ask cause better to be safe then sorry haha.

- and lastly my big dilemma is I want to run fuel injection. I bought the heads and intake (Edelbrock victor jr single plane) as a combo deal so figured I d use the intake. But it s the large dominator bolt pattern and the only Holley fuel injection kit I ve found that fits dominator is the 4500 series that supports 800-1500hp and is 1440cfm. Do you think it s going to be way to much for my combo and might be better off just getting an adapter plate and running the standard Holley sniper 4150 series that s good up to 650hp?
If so I know them adapter plate are around 2 thick and do you think I would then run into any hood clearance issues? I dk have a fiberglass 4 cowl on my 1971 Chevelle so have some extra room.

I know it s a lot but honestly don t really know a lot of gear heads yet here at where I m stationed now so any info or advice is greatly appreciated! Thank you and hope to hear from you.
Was this
answer
helpful?
Yes
No
Friday, March 26th, 2021 AT 4:55 PM
Tiny
RYAN L
  • ADMIN
Hello, Ray!

Very cool! Sounds Awesome!

Yes we did. We are right at 10.5:1. Summit has a really great tool to figure out your compression ratio. https://www.summitracing.com/newsandevents/calcsandtools/compression-calculator

We did not just because we knew our dome top was not going to be high enough to hit any kind of valve. It is really easy to tell too. As you are putting the valvetrain together, if it is going to hit, it would as you assemble it and turn the engine over. So you know to stop.

Yeah that intake is a bit much for what looks similar to my build. That is more of a street build with a dual plane intake so it fits the lower CFM style. In your build you really do not need the 1440 CFM that is really ridiculous for this. Yeah I guess I would go with the adapter even though I do not like them. Personally I would just get the dual plane intake but, that is just me.

Not a problem at all. I love helping people and talking about hot rods. Thanks so much for using 2CarPros!

Best,
Ryan
Was this
answer
helpful?
Yes
No
Saturday, March 27th, 2021 AT 5:12 PM

Please login or register to post a reply.

Related General Content

Sponsored links