What size intake runners for a street bruiser 327?

Discussion in 'High Performance Modifications' started by slayer021175666, Mar 3, 2018.

  1. Mwilson

    Mwilson Veteran Member

    Agree gears will do more
  2. larrylarry

    larrylarry Veteran Member

    Dec 22, 2011
    San Antonio Tx
    I agree, gears would make a big difference but a TH350 an something around 3.42’s will give you 3100 rpm’s at 70 mph. That’s what mine used to do.
  3. Lee45

    Lee45 Member

    May 28, 2017
    depends on tire height
  4. Mwilson

    Mwilson Veteran Member

    if you do much hywy cruising your not gonna want to go past 3.42 with a th350 and 26"-28" tire, the best thing for torque is really cubic inches or a blower! lol
  5. 1980RS

    1980RS Veteran Member

    Jun 17, 2006
    That's a tough one. Every time I have put in more gear I gain around a tenth or so with them, then with the old gears but with a new stall converter I gained more than 3 tenths. Case in point, I owned a 71 Nova with mild and I mean mild 400SB. All it had was a 268H CC, Performer intake, stock GM heads and El-cheapo headers. I did put a TCI street fighter in her and went to the 1/8 mile and ran the best of 8.38 and the car had 2.56 gears. I changed gears to 3.42 and the car slowed to a 8.50 WT%$^&, but really happened is that the power band was now changed as I only shifted it at 5200. My Camaro is no different, I have 4.10 gears and at that time running a healthy 355 and it was 11.40 car. Changed gears to 4.88 and guess what?, the car was an 11.40 car. The only numbers that were better were the 60ft. times that it and 1 more mph. Gears perform the best as to where the power band is. Low RPM bit TQ. engines like less gear, screamy small engines like more gear, IMO.
  6. Mwilson

    Mwilson Veteran Member

    gears always feel better on the street even if the ET changes little to none. years back my car was going 8.50 ( 1/8 mile ) and I switched from 3.31 to 4.10 it still went 8.50 but with the 3.31 I crossed in 2nd turning 6,000 with the 4.10 I had to shift and crossed in third turning 5,000 +/- but I bet my 1/4 mile would have been better and the gears made a huge seat of pants difference on the street.
  7. slayer021175666

    slayer021175666 Veteran Member

    Feb 29, 2016
    Big Gear Head told me to get 342s if I switch to a 700r4. Said the lower first gear it the tranny would be like having 4.33s. I thought about going to 342s whether I switch trannys or not but, some (Fatkid, for one) said it wouldn't be a big enough change to even bother with. I don't know.
  8. tjs69camaro

    tjs69camaro New Member

    Feb 11, 2012
    Mazeppa MN
    If you want to keep the camel backs only use the stock old school cams or one that has been tried or proven ! Most new camshafts create too much port velocity. It will drive like an old truck with 4.10's and stuck in low lock ! I have an ultradyne 270H camshaft in my 327 and it was too much for the camel backs. I installed Edelbrock E-Street heads and now (with the larger 185cc ports) it runs great ! My combo puts out about 375 to 400 HP at the crank. My point is camel backs and new modern camshafts don't mix very well. I have 4.11 gears and a 700r4 combo. I wouldn't recommend it. 3.42's should work well. I have 3.73's ready to go in. I have a 4 series Eaton, so I can only switch as high as 3.73's. Just giving you some info. about what I have went through.
    Last edited: Mar 6, 2018
  9. Mwilson

    Mwilson Veteran Member

    if the old heads are worn out I wouldn't sink money in them to fix them though (been there) alot depends on if you do your own work? set of used 3.42's some fluid, seals & bearings and 1/2 a Saturday in the garage doesn't cost alot compared to paying someone.
  10. Mwilson

    Mwilson Veteran Member

    heads are a big investment if you think your going 350 or 383 in the future I'd buy heads now for that motor I wouldnt be scared of 195 or 200 they may not make much power on your motor but your ahead of the game on the next one.

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