Thread: Intake

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Originally Posted by noel t

I have this intake DOOE-9425-C 6J12 will work w/tj 429 HELPI

It is a direct bolt-on fit. The ports on that intake manifold are larger than the ports on the TJ heads, but it bolts up fine and offers up more power on a TJ engine than the TJ intake.

Originally Posted by noel t

yup its a square bore . how much more power well i gain with scj intake then stock ??? 429

According to Ford, when installed onto the 460 Marine engine they see a claimed 30 hp gain in the upper rpm range.

Whether or not you port match the TJ cylinder head's intake runners to the CJ intake depends entirely on the application. Sometimes it helps power and sometimes it hurts it. Given the use of a stock 429 engine in a 4x4 truck, I would say leave the TJ intake ports as they are and keep the port velocity; the increased plenum volume of the CJ intake is what will give you you overall power increase.

Paul