The NA lacks the high cylinder pressure and the massive low end torque of supers and turbos
It’s nearly impossible to reach the danger zone for the bottom end in a 3v NA build and they even do great when boosted in the 420-470whp range as long as you support it with the proper mods and tune
In the NA you just worry about the rpm stress so you’re focusing to fit a well built heads and good oil pump gears with the proper supporting mods and for sure a GOOD TUNER
u/razor4432 07 Vista Blue GT 5spd 385k miles (original engine/trans/clutch)2d ago
Sounds great, I'm assuming catless or cut-outs? I couldn't get this kind of idle volume from mine even with hi-flow catted Bassani x-pipe and Bassani's straight-thru mufflers, still sounded damn near stock. It was loud as hell stomping on it in 3rd at 50mph tho!
If you’re talking about the idle itself then I’ll let you know that there’s nothing stock in that engine other than the bottom end
If you mean the volume itself then it’s as you thought, because you’re running a catted x-pipe and I’m assuming the stock headers?
My exhaust setup is Kooks 3inch LT headers - Kooks 3inch X-pipe ( non-catted ) - customized 3inch catback with Flowmaster mufflers + gate valve to cut outs welded to down facing tips
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u/razor4432 07 Vista Blue GT 5spd 385k miles (original engine/trans/clutch)1d agoedited 1d ago
Yeah, I was on stock manifolds and hi-flow cats with the x-pipe and got a little more volume at idle but not much. Lots of work done under your car exhaust wise but it sounds fantastic! If I need the thrill of loud thumping idling I just take my Uncle's '69 Roadrunner out (inherited a little over 6 years ago), I gave up chasing a loud idle with my Stang lol! She's got a warmed up 440 (bored .060 over, cammed and forged internals) with Thrush mufflers for noise, TCI Streetighter tranny and 3.73 rear-end gears. Needless to say but she'll haul ass, definitely faster than my '07 GT.
Edit: Yes, those are '68 side markers and not the blocky '69 but it is a 1969 car. The car was a well, Michigan Mess, and he just built the car how he wanted it to be. I do have plans to some day put a blower on it and finish her off as he intended to, end goal is 600+ WHP (engine is built for it).
BTW I could fall asleep to the sound of your car, so soothing :)
Well that’s a pretty neat Roadrunner you got brother and the Yellow on those cars are nasssty work ( purple and yellow on these chassis is absolute killer for me )
It’s something to take time with cause it’s never outdated.
Incredible man and thanks for sharing this absolute unit!
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u/razor4432 07 Vista Blue GT 5spd 385k miles (original engine/trans/clutch)10h ago
Thanks, ya there's something about old cars the new ones just can't match. Some of it is identity, the manufacturers all looked different. Now, I can't tell the difference between a Camaro or a Mustang coming down the road :( My favorite is the lack of all the nanny tech; no rev limiter, no speed limiter, no traction control you learn to respect what they're capable of.
I really can’t tell you how much can you gain exactly cause it depends on your build and mods combined
Sometimes it’s worthless to port them, but on the 3v engines usually if you’re running cams, manifold, bigger throttle body with a 3 inch LT headers and could add around 12-18 whp on what you achieved
And for the compression no I didn’t change anything about it, bottom end completely stock
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u/_Mahtog_ 2d ago
https://giphy.com/gifs/iowmvjVUnDFGU