193 heads, swap them out??
08-23-2011, 12:36 PM
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Car: '88 IROC-Z / '91 Z28 / '91 GTA
Engine: LT4 Hot Cam 305 / L98 355 / MR 383
Transmission: 5-spd / 700R4 / 700R4
Axle/Gears: 3:45 / 3:23 / 3:23
193 heads, swap them out??
I bought a motor from an engine shop with full 5 year/50,000 mile warrenty. 4-bolt main 383 came with XR264HR cam, 1.6 roller tip rockers, on 'profressionally ported' and cleaned up 193 heads. Combo runs well with plenty of torque in my 91Z28 TPI.
I am pulling this motor and dumping it into my miniram 91GTA.. hopefully it will be a good combination.
Here is my dilema; I have a nice set of 'home ported' 113 aluminum heads. So should I put them on now while the engine is out? Will I see that much gain, if anything? If I do change the heads, are they an exact replacement (direct bolt in), or do I have to measure rod length, etc.
I am pulling this motor and dumping it into my miniram 91GTA.. hopefully it will be a good combination.
Here is my dilema; I have a nice set of 'home ported' 113 aluminum heads. So should I put them on now while the engine is out? Will I see that much gain, if anything? If I do change the heads, are they an exact replacement (direct bolt in), or do I have to measure rod length, etc.
08-23-2011, 02:41 PM
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Re: 193 heads, swap them out??
IDK about the bolts, since you're supposed to use washers under the head bolts on aluminum heads. But IIRC, the 193s are swirl-ports. If so, the power improvement should be dramatic! Unless the port job on the aluminum heads made them worse.
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